Independent integrity check

Verify a preservation archive

Confirm that every signed payload matches checksums.sha256, the manifest agrees with those declarations, and the package contains no unsigned or unsafe files.

No file uploadsRemote content blockedOriginal file preserved

Verify a preservation ZIP

Recalculate every declared SHA-256 value and compare the manifest without uploading the archive.

Choose a preservation ZIPMaximum 150 MB compressed · 250 MB verified expansion